Hello friends.

 I have a rpoblem with object orientation. Intention is to define
 instances usable from all classes. For example:

 	class Configuration
		attr_reader :size
	
		def initialize(size)
			@size = size
		end
	end

	class Foo
		def initialize
			puts @conf.size
		end
	end

	attr_reader :conf
	@conf = Configuration.new(100)
	Foo.new

	exit(0)

 Why I can not use attr_reader form base class?. Might I use a global
 variable to define instance?.

 I need your ideas about "best way of doing it" :)

 Thanks.

 							David